/*
 * @Author: 番茄炒蛋蛋 wzh15802755802@163.com
 * @Date: 2024-05-23 14:51:49
 * @LastEditors: 番茄炒蛋蛋 wzh15802755802@163.com
 * @LastEditTime: 2024-05-23 14:52:00
 * @FilePath: \vue-element-admin-master-2\src\directive\directive.js
 * @Description: 这是默认设置,请设置`customMade`, 打开koroFileHeader查看配置 进行设置: https://github.com/OBKoro1/koro1FileHeader/wiki/%E9%85%8D%E7%BD%AE
 */
import Vue from 'vue';
 
Vue.directive('dialogDrag', {
  bind(el, binding, vnode, oldVnode) {
    const dialogHeaderEl = el.querySelector('.el-dialog__header');
    // const dialogHeaderEl = el.querySelector('.el-dialog__footer');
    const dragDom = el.querySelector('.el-dialog');
    //dialogHeaderEl.style.cursor = 'move';
    dialogHeaderEl.style.cssText += ';cursor:move;'
    dragDom.style.cssText += ''
 
    // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
    const sty = (function () {
      if (window.document.currentStyle) {
        return (dom, attr) => dom.currentStyle[attr];
      } else {
        return (dom, attr) => getComputedStyle(dom, false)[attr];
      }
    })()
 
    dialogHeaderEl.onmousedown = (e) => {
      // 鼠标按下，计算当前元素距离可视区的距离
      const disX = e.clientX - dialogHeaderEl.offsetLeft;
      const disY = e.clientY - dialogHeaderEl.offsetTop;
 
      const screenWidth = document.body.clientWidth; // body当前宽度
      const screenHeight = document.documentElement.clientHeight; // 可见区域高度(应为body高度，可某些环境下无法获取)
 
      const dragDomWidth = dragDom.offsetWidth; // 对话框宽度
      const dragDomheight = dragDom.offsetHeight; // 对话框高度
 
      const minDragDomLeft = dragDom.offsetLeft + dragDomWidth;
      const maxDragDomLeft = screenWidth - dragDom.offsetLeft;
 
      const minDragDomTop = dragDom.offsetTop;
      const maxDragDomTop = screenHeight - dragDom.offsetTop;
 
 
      // 获取到的值带px 正则匹配替换
      let styL = sty(dragDom, 'left');
      let styT = sty(dragDom, 'top');
 
      // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
      if (styL.includes('%')) {
        styL = +document.body.clientWidth * (+styL.replace(/\%/g, '') / 100);
        styT = +document.body.clientHeight * (+styT.replace(/\%/g, '') / 100);
      } else {
        styL = +styL.replace(/\px/g, '');
        styT = +styT.replace(/\px/g, '');
      }
      ;
 
      document.onmousemove = function (e) {
        // 通过事件委托，计算移动的距离
        let left = e.clientX - disX;
        let top = e.clientY - disY;
 
        // 边界处理
        if (-(left) > minDragDomLeft) {
          left = -(minDragDomLeft);
        } else if (left > maxDragDomLeft) {
          left = maxDragDomLeft;
        }
 
        if (-(top) > minDragDomTop) {
          top = -(minDragDomTop);
        } else if (top > maxDragDomTop) {
          top = maxDragDomTop;
        }
 
        // 移动当前元素
        dragDom.style.cssText += `;left:${left + styL}px;top:${top + styT}px;`;
      };
 
      document.onmouseup = function (e) {
        document.onmousemove = null;
        document.onmouseup = null;
      };
    }
  }
})